The Act of Roger Murgatroyd
Gilbert Adair Faber and Faber (2006)
I personally found this homage/parody/pastiche of the murder-in-the-isolated-countryhouse witty, droll and wry. In other hands it would have be leaden, heavy-handed.
If you want to you can dip “below” the surface, beneath the “metafictional” asides there’s stuff about unreliable narrators, deconstruction etc. The climax is extremely reminiscent of Adair’s early “The Death of the Author” (that’s not a bad thing).
See alsoAgatha Christie’s The Murder of Roger Ackroyd